Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 7d66d00114a19baf…

MALICIOUS

Office (OOXML) / .XLSM

430.9 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-07-19
MD5: f99f2e0dc7fb7af396aee4c7fee03152 SHA-1: 2b244d69241b82d5a3efcd37d2abd5b90f3bb4c4 SHA-256: 7d66d00114a19baf515b19caaa434a322dd3c5f88f015e69cffc0f0257f63668
402 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The Workbook_Open macro in this XLSM file is designed to execute a PowerShell command. This command is obfuscated but reconstructs to download a file from http://62.233.57.190/z1/quote111.exe and execute it. This indicates a downloader or droppper functionality.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://62.233.57.190/z1/quote111.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e3e677b3c424116069563af678cb2dcad07387023087bc217e2a784f9da64c2e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1266 bytes
vbaProject_00.bin
66b2bd4394e5bc25d31fa423837eabfcd430acb419db450e2aac287aa327a932		 vba-project OOXML VBA project: xl/vbaProject.bin 5120 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.